Rafael Nadal's bustling comeback is gathering momentum and, after playing a third tournament in four weeks following a seven-month injury lay-off at the Mexico Open, the 11-times grand slam winner steps out on Monday into New York's estimable Madison Square Garden for an exhibition match. The world No5's opponent will be the man ranked two places below him, the 2009 US Open champion, Juan Martín Del Potro of Argentina, and is billed as the BNP Paribas Showdown. Also appearing are Serena Williams, the women's No1, and Victoria Azarenka. All of which adds credence to Nadal's plans to play the forthcoming hard court Masters Series events at Indian Wells and Miami, although he continues to experience pain in his knee. Tickets are available.http://www.guardian.co.uk/sport/2013/mar/02/rafael-nadal-london-welsh-mls

17yo Nick Kyrgios this morning won the Sydney Challenger event, becoming the youngest player since Tomic to win a Challenger event.

This kid is going to be big, make no mistake about it. In two tournaments he's already surpassed what Oli Golding won in all of 2012, and that was with no Juniors to distract him. He will also surpass Luke Saville - two time junior champion and very highly rated junior who is ranked in the top 350.

Australia are going to be one of the biggest nations in the sport in a few years time. Tomic, Kyrgios, Saville and Kokkinakis all have the talent to go to the very top (of course fulfilling that talent is another matter), and that's not to mention Duckworth, Kubler, Mitchell or Bolt who are probably future top 100 players.

I'm tipping Kyrgios to break the top 100 this year.

And with Quinzi, Zverev Jr. and Garin (who we all saw in Vina Del Mar), maybe there are finally some youngsters breaking through who will be able to hit the heights of the current top 4.

Elsewhere, Renzo Olivo was edged out 9-7 in a final set tie-break to Gonzalez in Santiago. Him and Schwartzman are two of Argentina's more promising youngsters, who would probably be ranked higher up if Argentina had more events. There was an article not long ago talking about the ridiculous amount of US tournaments - and therefore Wild Cards - the young Americans get, whilst the likes of Schwartzman, Clezar (both won Challenger titles last year) and Olivo have to playing Futures and Challenger qualifying instead, and thus progress far slower.

17yo Nick Kyrgios this morning won the Sydney Challenger event, becoming the youngest player since Tomic to win a Challenger event.

This kid is going to be big, make no mistake about it. In two tournaments he's already surpassed what Oli Golding won in all of 2012, and that was with no Juniors to distract him. He will also surpass Luke Saville - two time junior champion and very highly rated junior who is ranked in the top 350.

Australia are going to be one of the biggest nations in the sport in a few years time. Tomic, Kyrgios, Saville and Kokkinakis all have the talent to go to the very top (of course fulfilling that talent is another matter), and that's not to mention Duckworth, Kubler, Mitchell or Bolt who are probably future top 100 players.

I'm tipping Kyrgios to break the top 100 this year.

And with Quinzi, Zverev Jr. and Garin (who we all saw in Vina Del Mar), maybe there are finally some youngsters breaking through who will be able to hit the heights of the current top 4.

Elsewhere, Renzo Olivo was edged out 9-7 in a final set tie-break to Gonzalez in Santiago. Him and Schwartzman are two of Argentina's more promising youngsters, who would probably be ranked higher up if Argentina had more events. There was an article not long ago talking about the ridiculous amount of US tournaments - and therefore Wild Cards - the young Americans get, whilst the likes of Schwartzman, Clezar (both won Challenger titles last year) and Olivo have to playing Futures and Challenger qualifying instead, and thus progress far slower.

Didn't Kyrgios beat Ward in another Challenger event final earlier this year?

17yo Nick Kyrgios this morning won the Sydney Challenger event, becoming the youngest player since Tomic to win a Challenger event.

Quite a day for him - played singles SF and F, also doubles F

GTC’s world junior number one Nick Kyrgios of Australia captured his first ATP Challenger Tour title following back to back semi-final and final victories in Sydney on Saturday afternoon.....

Nick also reached the doubles final but went down in a final set tiebreak alongside Alex Bolt to fellow Aussies Dane Propoggia and Brydan Klein 6-4 4-6 11-9....

I am very tired after three matches in one day, it’s not often I do that but it’s been worth it, it would have been great to win the doubles too but I would have ripped your arm off for this at the start of the week, so all in all a very positive week and a big step forward.”

In New York, Nadal v DelPo, Serena v Azarenka.Djoko in LA to play an exhibition match LA Tennis Challenge with Mardy Fish, Tommy Haas, James Blake, Pete Sampras and Bryan Brothers In Hong Kong - this lot:There's an article in the Times, but you have to pay to readWorld Tennis Day ‏@WorldTennisDay: Check out coverage of Andy Murray, London and #WorldTennisDay by @NeilHarmanTimes. http://www.thetimes.co.uk/tto/sport/tennis/article3704515.ece?CMP=OTH-gnws-standard-2013_03_03 …

Having just looked at the singles race to London it is not surprising that Ferrer is looking tired he has played already played 6 tournies this year. Andy has only played 2 and is in 3rd place. All the rest have played 3 or more.